Article Archive
Article Archive
- Introduction of Cement Slurry System (Part 1)
- Introduction of Cement Slurry System (Part 2)
- Introduction of Cement Slurry System (Part 3)
- Introduction of Cement Slurry System (Part 4)
- High Temperature and High Pressure Cementing Technology
- Low Density Cementing Slurry Technology
- Anti Gas Channeling Cementing Technology
- Drag Reducing Agents (DRA) or Drag Reducers (DR)
- Nitrogen Surfactant Compound Huff and Puff Technology
- Oil Washing Technology for Increasing Production
Polymer filtrate reducer is a kind of non-ionic polymer and anionic polymer, which has the advantages of various varieties and excellent performance.
Synthetic polymer fluid loss reducer has many kinds and excellent properties, which are incomparable to natural products. Therefore, it has become the focus of researchers in various countries.
PVA (polyvinyl alcohol) system is a kind of non-ionic fluid loss reducer widely used in China, with unique advantages. Typical products are ZOC-X60S of Qingdao Zoranoc Oilfield Chemical Co., Ltd. The service temperature of the system can reach 95 ℃. When the temperature is higher than this, the crosslinking bond is destroyed and the filtration loss reduction performance becomes worse. In addition, the salt (NaCl) resistance of the system is poor, and the salt resistance is generally not more than 5%. In order to improve the poor temperature and salt resistance of PVA system, chemical crosslinking can be used to modify PVA, such as condensation reaction of alcohol groups of PVA with condensation agents such as aldehydes or acids to obtain partially crosslinked PVA. The chemically crosslinked PVA can be used alone without borax and other crosslinking agents. The temperature resistance can reach 120 ℃, the salt resistance can reach 8%, and the filtration loss can be controlled below 50ml.
Anionic polymer
Anionic polymer is a kind of fluid loss reducer with the most extensive research and the most kinds of products at home and abroad. Its comonomers include nonionic and anionic monomers. Nonionic monomers mainly include AM (acrylamide), NVP (N-vinyl pyrrolidone), NNDMA (n, N-dimethylacrylamide), ST (styrene), VI (vinyl imidazole), VFA (vinyl formamide), VP (vinyl pyridine), VMAA (n-methyl-n-vinyl acetamide), etc. Among these monomers, am is easy to hydrolyze, so the content in the copolymer should not be too much; NNDMA introduces a group that is not easy to hydrolyze, and its high temperature resistance is obviously enhanced. However, this monomer is expensive, and it is still in the small-scale test stage in China. Anionic monomers mainly include two types: one is sulfonate monomers, such as AMPS (2-acrylamide-2-methylpropanesulfonic acid), SS (styrene sulfonate), VS (ethylene sulfonate), PS (propylene sulfonate); The other is carboxylate monomers, such as AA (acrylic acid), MAA (methacrylic acid), HEA (hydroxyethyl acrylic acid), IA (itaconic acid), etc. AMPS has strong temperature and salt resistance, high polymerization activity and increasingly wide use, and has formed large-scale production in China.
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